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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Summary of Significant Accounting Policies

Schedule of stock-based compensation expense

During the three and six months ended June 30, 2018 and 2017, the Company recorded stock-based compensation expense for employee and non-employee stock options, which was allocated as follows in the condensed consolidated statements of operations (in thousands):

		Three Months Ended June 30,						Six Months Ended June 30,
		2018			2017			2018			2017
Research and development		$	164		$	197		$	337		$	397
General and administrative		282			284			587			589
Total		$	446		$	481		$	924		$	986

Schedule of anti-dilutive common stock equivalents excluded from calculation of diluted net loss per share

		Three Months Ended June 30,				Six Months Ended June 30,
		2018		2017		2018		2017
Stock options		3,689,220		2,801,850		3,689,220		2,801,850
Common stock warrants		42,024,566		24,566		42,024,566		24,566
		45,713,786		2,826,416		45,713,786		2,826,416

Schedule of reconciliation of cash, cash equivalents and restricted cash

		June 30,
		2018			2017
Cash and cash equivalents		$	49,931		$	29,369
Restricted cash		113			113
Total		$	50,044		$	29,482

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